Use plastic/milk cartons for deep watering by heating a Phillips head screwdriver (I use the gas stove and a hot mitt) and punching several holes in the bottom and sides (3" from the bottom) of a plastic jug or milk bottle. Bury the jug around the tree line or around the base of a shrub. Bury it so that the opening is just above the soil level. Bury as many jugs as you wish around the tree/shrub line. Fill the jugs with water for a slow deep watering. Add liquid fertilizer as needed for deep feeding.

I've used this method for years and adding that I poke holes in the lid , screw it back on . Keeps toads and other creatures from getting trapped in the jug .That happened once . I also have used small flat rocks to cover the opening